Red Grid MGRS
DAGR-Class Military GPS Navigator
The military's DAGR costs $2,500 and weighs a pound. Red Grid MGRS puts the same core land navigation capabilities in your pocket for $3.99. Zero network. Zero tracking. Open source.
The military's DAGR costs $2,500 and weighs a pound. Red Grid MGRS puts the same core land navigation capabilities in your pocket for $3.99. Zero network. Zero tracking. Open source.
4/6/8/10-digit precision. 1-meter resolution. Tap to copy any grid to clipboard.
WMM 2025 model (same as DoD). Auto-calculate or manual offset.
Save positions. Get bearing, distance, and a compass-relative arrow to any waypoint.
Back azimuth, dead reckoning, resection, pace count, TDS, sun/moon, precision selector.
SALUTE, 9-Line MEDEVAC, SPOT, CASEVAC, ICS 201, CFF. Fill and copy, radio-ready.
No analytics. No tracking. No accounts. GPS coordinates never leave your device.
| Feature | Red Grid MGRS | DAGR (AN/PSN-13) | Tactical NAV | MilGPS |
|---|---|---|---|---|
| Price | $3.99 | $2,500 | $4.99+ | $4.99 |
| Live MGRS | ✓ | ✓ | ✓ | ✓ |
| Magnetic Declination | ✓ WMM 2025 | ✓ | ✓ | ✗ |
| Report Templates | ✓ 6 types | ✗ | ✗ | ✗ |
| Open Source | ✓ | ✗ | ✗ | ✗ |
| Zero Network / Tracking | ✓ Verified | ✓ | Unknown | Unknown |
| Tactical Tools | ✓ 8 tools | Limited | Some | Basic |
| Weighs | 0 lbs (your phone) | 1.0 lb | 0 lbs | 0 lbs |
Red Grid MGRS makes zero HTTP requests during normal operation. Your position data exists in memory only.
For training, STXs, ruck marches, and permissive GPS environments: yes. The DAGR's SAASM module matters in contested environments, but for the other 90% of use, Red Grid MGRS delivers the same core land nav capabilities.
Yes. The app uses your phone's GPS receiver, which communicates directly with satellites. No cell tower, no Wi-Fi, no internet required. Works in airplane mode.
None. Zero analytics, zero tracking, zero crash reporting. GPS coordinates exist in memory only. Read the source code to verify.
MGRS is built on UTM but adds a grid zone designator and 100km square identification. Red Grid MGRS shows both formats (Pro feature), plus decimal degrees and DMS.
Red Grid MGRS uses the DMA (Defense Mapping Agency) MGRS algorithm with the Vincenty formula for bearing/distance calculations (sub-millimeter accuracy on the WGS84 ellipsoid). The same math the DAGR uses. GPS accuracy depends on your phone's receiver chip and satellite geometry.
No. $3.99 buys the app. $9.99 Pro upgrade is one-time. No recurring charges, ever.
The codebase is cross-platform (React Native / Expo). Android builds work today. We're polishing the iOS experience first and will launch Android once the feature set matures. Star the GitHub repo to stay updated.